The purpose of cotton mask is to combine both properties of cotton and PVA, hopefully could make a mask strong enough to wear, but the important thing is the mask can suit everyone by their different face of different angle. So use the PVA property which is water-soluble, then spry a little bit water on the mask, then use the new property, which is PVA+cotton, a toughness style cotton to fix different angle of face, so that makes people feel more comfortable when wearing masks.
images of final model- cotton mask:
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